it is on the left side of the evaporator. you can get acces to it if you remove lining under the steering wheel and then you will find two wires which goes somewhere into evaporator. there is one metal clip which holds these wires at the evaporator. at the end of wires there is a sensor. you must pull it towards left side of the car. no screws, only pull it. it is about 20 to 30 cm above the car's floor (that's how i remember).

 

What troubles are you having??

The way to test is this:

Run the car for a few minutes with A/C ON, temp 72.

Hold the "REST" button down for around 5 seconds.

Your A/C Panel "Screen" should read "1" on the left side, and your cabin temp on the Right (it might be either degrees C or F).

Hit the LEFT sided "AUTO" button 4 times, until the "5" number is on the left. This is the Evaporator Temp. *IF* you are blowing cold air, then this should be in the 45 Deg F range (or C equivalent).

If you hit the left auto button two more times ("7" on left) this will be your R134a PRESSURE. Should be in the "mid teens" if you have sufficient coolant, and the compressor is functional.

 

THis is it in a nutshell, I put a new compressor in with a new reciever dryer,the only thing i didn't change was the expansion valve..The system was vacuumed and seemed to hold a suction(no leaks) but the air just isn't that cold maybe 68 degrees F... The compressor always is on like it never goes off,so i thought the air should be colder but it isn't.. I don't know what else to replace so does the evap temp sensor have anything to do with the problem i'm experiencing??? any suggestions?????

 

Does your receiver/dryer have the sight glass?
They took this away on later models.
If you are low on refrigerant you will see bubbles in the sight glass whilst running the air con, indicating an undercharged system. Spec for my car is 2.6lbs w/out rear AC, a .3lb difference will make the system inefficient and never reach the temp it should.

It MUST be charged to spec.
When I did mine the first time the supply tank in the machine became exhausted so I only got 2.22lbs of charge which makes the system work but not as well as I like. 56-58F at the vents with low charge, nope, no good, I like my air con FREEZING!

While working on a customers 99 CL600 I made comparisons. The air from that car blew at the vents 48F and the diagnostic display read 38-40F evap temp. I then knew I had to charge the rest of the system for superior operation.

And it should take no more than a minute or two to reach icy cool air, if you have to wait till you start moving and it takes 10mins or so, charge that baby up!

And last, look after your duovalve and make sure the core feed lines are not scorching hot indicating a failed valve(s).

 

Could the expansion valve be bad????

 

Maybe, but like The Andrew said, if the refrigerant charge is slightly low the compressor will run all the time and the air will never be cold enough.I personally would hang a set of gauges on the system and see where you are at. Using an a/c machine to put in the exact charge weight is the best way to go. Doing it by feel is not accurate enough.

 

Do you know what the guages should read ie low side 34 high side??? thanks

 

Although I haven't found a source for these pressures for our models, the 2000 Haynes Techbook Automotive Heating & Air Conditioning book has some other MB values:

1984 thru 1986
190's: Lo-24 to 34, Hi-230 to 275
All other models: Lo-22, Hi-265

1987 thru 1992 (all models): Lo-24 to 34, Hi-230 to 275

1993 and 1994
190E: Lo-24 to 34, Hi-230 to 275
All other models: not available

1995 thru 1999 (all models): not available

************************************************
SO...although not guaranteed, I'd say a good reference would be

Lo-24 to 34, Hi-230 to 275

These ranges fit my '97 S320 (R134a).

Keep in mind that R12 wasn't replaced w/R134a until around 1994 (I don't know exactly when the W140's switched), so these pressures look like they're all for R12 and none for R134a.

However, comparing other car brands and their pressures w/R12 -vs- w/R134a, I don't see any significant differences after the change. My son's '94 Nissan truck was the first year to have R134a. Before the switch, Maxima had some pressure changes, probably simply due to design, but also changes around 1994, e.g.:

Maxima in 1990, Lo-18 to 28, Hi-162 to 232 (definitely R12).
Maxima in 1991-1993, Lo-16 to 27, Hi-155 to 213 (definitely R12).
Maxima in 1994, Lo-18 to 23, Hi-188 to 230 (switch to 134a?)
Maxima in 1995-1997, Lo-20 to 24, Hi-142 to 189 (assuming R134a).
Maxima in 1998-1999, Lo-20 to 26, Hi-147 to 177 (assuming a design diff).

 

MB220:

My car has a build date of 11/92, it was factory r134. In it's introduction the W140 was advertised as a "green" car, no CFCs in the air con, water based paint, recycled materials etc etc.

The only real difference in R12 systems is the fittings to charge the system, the compressor will still work. This is of course for folks who have gone from r12 to r134a.

 

Ok this is what i'm goin to do,i'm going to vac the system one more time change the expansion valve and drier then recharge it what do you guys think any other suggestions?????????????

 

Before you go flushing a bunch of money down the toilet, why not run the diagnostics I suggested to you, and post the results??? List the values of item 1 through 7 as well as the DTC codes.

Also, fill out your User Profile... so we know what sort of vehicle you are having the problem with.



Here is the procedure for DTC readout:

Ignition ON
Temperature selector left "HI", right "LO".
Within 20 seconds, press REST and EC simultaneously for more than 5 seconds
The led in the RECIRCULATE button flashes and the display shows "di R"
Press AUTO repeatedly until all DTC's (refer to DTC table) are displayed. Record each DTC as it is displayed.
Each malfunction (short circuit, open circuit, etc.) has a specific DTC assigned to it.
The letter "E" (Error) is displayed in the left side of the display and the DTC is displayed in the right side of the display. By pressing the right AUTO button, the next DTC stored in memory will be displayed.

To erase: Only possible after all DTC's are read out. Simultaneously press both AUTO > 2 secs. "d" will be displayed in the left side of the display window and "FF" on the right side.
To cancel erase: By pressing AUTO the current faults will appear again.

Set temperature selector to normal setting.
Turn ignition OFF to end test.

DCT table:

B1226 - In-car temperature sensor (B10/4)
B1227 - Outside temperature indicator temperature sensor (B14)
B1228 - Heater core temperature (B10/1)
B1229 - Heater core temperature (B10/1)
B1230 - Evaporator temperature sensor (B10/6)
B1231 - ECT sensor (B11/4)
B1232 - Refrigerant pressure sensor (B12)
B1233 - Refrigerant temperature sensor (B12/1)
B1234 - Sun sensor (B32)
B1235 - Emissions sensor (B31)
B1241 - Refrigerant fill
B1416 - Coolant circulation pump (M13)
B1417 - Duovalve (Y21y1), left
B1418 - Duovalve (Y21y2), right
B1419 - Electromagnetic clutch (A9k1)
B1420 - Idle speed increase
B1421 - Pulse module (N65)
B1422 - Series interface (K1) connection to instrument cluster (A1)
B1423 - Switchover valve block (Y11)
B1424 - Activated charcoal filter actuator (A32m2) open
B1425 - Activated charcoal filter actuator (A32m2) closed
B1432 - Non-USA DTC
B1459 - Series interface (K2) connection to instrument cluster (A1)
B1462 - Wide open throttle (WOT) position signal: diesel engines

 

When I tried to pull those codes nothing happened. So I tried just holding the REST button for 5 seconds, and I was able to pull some codes. 1 - 8, plus 9 and 16.

Is there a different procedure for a 92 S320?

 

When I tried to pull those codes nothing happened. So I tried just holding the REST button for 5 seconds, and I was able to pull some codes. 1 - 8, plus 9 and 16.

Is there a different procedure for a 92 S320?

This is copy paste from one thread edited by merc600sec in year 2004 (my remark is that both selector wheels must be to the end ... you must hear "click" sound):

Reading DTCs from Auto A/C System
The following preparation are required for test:
- Set the LEFT TEMPERATURE selector wheel into the RED [red] area.
- Set the RIGHT TEMPERATURE selector wheel into the BLUE [blue] area.
- Turn Ignition to ON.
- Press left [AUTO] button.
- Within 10 seconds, simultaneously press [REST] and [O] buttons until the displays shows permanent stored DTCs in memory per the table below. Press the RIGHT [AUTO] button until all stored DTCs are displayed. Record each as they are displayed.
- Each fault has a specific DTC. The letter 'E' (error) along with the hundredth digit of the display code will show in the window. The tenth and single digit of the code displays in the right window. By pressing the right [AUTO], the next DTC stored in memory will be displayed.
- Turn the ignition OFF and repair recorded DTCs according to the respective diagnostic chart.

- To delete stored DTCs, repeat the first five (5) steps, then press the LEFT [AUTO] for the letter 'D' (delete) to appear in the window. By pressing the right [AUTO] the display code will be deleted from memory. Continue to press the left and right [AUTO] buttons until all codes are deleted from memory. The display will show 'E0 00'.
- Return the temperature selector to normal setting.

Display Code Possible Cause
E0 01 No faults in system
E0 02 A/C push button control module (N22)
E0 03 Rear climate control module
E0 06 Connection to switchover valve block (Y11)
E0 07 Data exchange (CAN B), short circuit
E0 08 Data exchange (CAN A), short circuit
E0 09 Data exchange (CAN A and B), short circuit
E0 10 Repeat displaying for malfunction readout
E0 11 Data exchange (CAN B), open circuit
E0 12 Data exchange (CAN A), open circuit
E0 13 connection to rear climate control module
E0 14 Data exchange (CAN B), open circuit (rear climate control)
E0 15 Data exchange (CAN A), open circuit (rear climate control)
E0 16 In-car temperature sensor w/ aspirator blower (B10/4), short circuit *)
E0 17 In-car temperature sensor w/ aspirator blower (B10/4), short circuit **)
E0 18 In-car temperature sensor w/ aspirator blower (B10/4), open circuit *)
E0 19 In-car temperature sensor w/ aspirator blower (B10/4), open circuit **)
E0 24 Left heater core temperature sensor (B10/2), short circuit *)
E0 25 Left heater core temperature sensor (B10/2), short circuit **)
E0 26 Left heater core temperature sensor (B10/2), open or short circuit *)
E0 27 Left heater core temperature sensor (B10/2), open or short circuit **)
E0 28 Right heater core temperature sensor (B10/3), short circuit *)
E0 29 Right heater core temperature sensor (B10/3), short circuit **)
E0 30 Right heater core temperature sensor (B10/3), open or short circuit *)
E0 31 Right heater core temperature sensor (B10/3), open or short circuit **)
E0 32 Outside temperature sensor (B10/5), short circuit *)
E0 33 Outside temperature sensor (B10/5), short circuit **)
E0 34 Outside temperature sensor (B10/5), open or short circuit *)
E0 35 Outside temperature sensor (B10/5), open or short circuit **)
E0 36 Evaporator temperature sensor (B10/6), short circuit *)
E0 37 Evaporator temperature sensor (B10/6), short circuit **)
E0 38 Evaporator temperature sensor (B10/6), open or short circuit *)
E0 39 Evaporator temperature sensor (B10/6), open or short circuit **)
E0 40 A/C Coolant temperature sensor (B10/8), short circuit *)
E0 41 A/C system coolant temperature sensor (B10/8), short circuit **)
E0 42 A/C system coolant temperature sensor (B10/8), open or short circuit *)
E0 43 A/C system coolant temperature sensor (B10/8), open or short circuit **)
E0 44 Refrigerant pressure sensor (B12), short circuit *)
E0 45 Refrigerant pressure sensor (B12), short circuit **)
E0 46 Refrigerant pressure sensor (B12), open or short circuit *)
E0 47 Refrigerant pressure sensor (B12), open or short circuit **)
E0 48 Left temperature selector wheel, short circuit *)
E0 49 Left temperature selector wheel, short circuit **)
E0 50 Left temperature selector wheel, open or short circuit *)
E0 51 Left temperature selector wheel, open or short circuit **)
E0 52 Right temperature selector wheel, short circuit *)
E0 53 Right temperature selector wheel, short circuit **)
E0 54 Right temperature selector wheel, open or short circuit *)
E0 55 Right temperature selector wheel, open or short circuit **)
E0 72 Heater supply unit circulation pup (A31m1), short circuit *)
E0 73 Heater supply unit circulation pup (A31m1), short circuit **)
E0 74 Heater supply unit circulation pup (A31m1), open or short circuit *)
E0 75 Heater supply unit circulation pup (A31m1), open or short circuit **)
E0 76 Heater supply unit circulation pump (A31m1), over load *)
E0 77 Heater supply unit circulation pup (A31m1), over load **)
E0 80 Heater supply unit left duovalve (A31y1), short circuit *)
E0 81 Heater supply unit left duovalve (A31y1), short circuit **)
E0 82 Heater supply unit left duovalve (A31y1), open or short circuit *)
E0 83 Heater supply unit left duovalve (A31y1), open or short circuit **)
E0 84 Heater supply unit right duovalve (A31y2), short circuit *)
E0 85 Heater supply unit right duovalve (A31y2), short circuit **)
E0 86 Heater supply unit right duovalve (A31y2), open or short circuit *)
E0 87 Heater supply unit right duovalve (A31y2), open or short circuit **)
E0 88 A/C compressor ground activation *)
E0 89 A/C compressor ground activation **)
E0 90 A/C compressor ground activation, open or short circuit *)
E0 91 A/C compressor ground activation, open or short circuit **)
E0 96 Auxiliary fan, 1st activation, short circuit *)
E0 97 Auxiliary fan, 1st activation, short circuit **)
E0 98 Auxiliary fan, 1st activation, open or short circuit *)
E0 99 Auxiliary fan, 1st activation, open or short circuit **)
E1 00 Auxiliary fan, 2nd stage activation, short circuit *)
E1 01 Auxiliary fan, 2nd stage activation, short circuit **)
E1 02 Auxiliary fan, 2nd stage activation, open or short circuit *)
E1 03 Auxiliary fan, 2nd stage activation, open or short circuit **)
E1 04 Auxiliary fan, 3nd stage activation, short circuit *)
E1 05 Auxiliary fan, 3nd stage activation, short circuit **)
E1 06 Auxiliary fan, 3nd stage activation, open or short circuit *)
E1 07 Auxiliary fan, 3nd stage activation, open or short circuit **)
E1 08 After-run pump relay (K30), power supply, short circuit *) ***)
E1 09 After-run pump relay (K30), power supply, short circuit **) ***)
E1 10 After-run pump relay (K30), power supply, open or short circuit *) ***)
E1 11 After-run pump relay (K30), power supply, open or short circuit **) ***)
E1 12 Engine rpm increase diode matrix (V2), short circuit *)
E1 13 Engine rpm increase diode matrix (V2), short circuit **)
E1 14 Engine rpm increase diode matrix (V2), open or short circuit *)
E1 15 Engine rpm increase diode matrix (V2), open or short circuit **)
E1 16 Charcoal filter actuator (A32m2) (OPEN), short circuit *)
E1 17 Charcoal filter actuator (A32m2) (OPEN), short circuit **)
E1 18 Charcoal filter actuator (A32m2) (OPEN), open or short circuit *)
E1 19 Charcoal filter actuator (A32m2) (OPEN), open or short circuit **)
E1 20 Charcoal filter actuator (A32m2) (CLOSED), short circuit *)
E1 21 Charcoal filter actuator (A32m2) (CLOSED), short circuit **)
E1 22 Charcoal filter actuator (A32m2) (CLOSED), open or short circuit *)
E1 23 Charcoal filter actuator (A32m2) (CLOSED), open or short circuit **)
E1 28 Left rear heater core temperature sensor (B10/9), short circuit *)
E1 29 Left rear heater core temperature sensor (B10/9), short circiut **)
E1 30 Left rear heater core temperature sensor (B10/9), short or open *)
E1 31 Left rear heater core temperature sensor (B10/9), short or open **)
E1 32 Right rear heater core temperature sensor (B10/10), short *)
E1 33 Right rear heater core temperature sensor (B10/10), short **)
E1 34 Right rear heater core temperature sensor (B10/10), short or open *)
E1 35 Right rear heater core temperature sensor (B10/10), short or open **)
E1 36 Left temperature selector wheel, short *)
E1 37 Left temperature selector wheel, short **)
E1 38 Left temperature selector wheel, short *)
E1 39 Left temperature selector wheel, short or open **)
E1 40 Right temperature selector wheel, short *)
E1 41 Right temperature selector wheel, short **)
E1 42 Right temperature selector wheel, short or open *)
E1 43 Right temperature selector wheel, short or open **)
E1 44 Right evaporator temperature selector wheel (B10/11), short *)
E1 45 Right evaporator temperature selector wheel (B10/11), short **)
E1 46 Right evaporator temperature selector wheel (B10/11), short or open *)
E1 47 Right evaporator temperature selector wheel (B10/11), short or open **)
E1 48 Coolant circulation pump (A31/1m1), short *)
E1 49 Coolant circulation pump (A31/1m1), short **)
E1 50 Coolant circulation pump (A31/1m1), short or open *)
E1 51 Coolant circulation pump (A31/1m1), short or open **)
E1 52 Coolant circulation pump (A31/1m1), overload *)
E1 53 Coolant circulation pump (A31/1m1), overload **)
E1 56 Left duovalve (water value, A31/1y1, short *)
E1 57 Left duovalve (water value, A31/1y1, short **)
E1 58 Left duovalve (water value, A31/1y1, short or open *)
E1 59 Left duovalve (water value, A31/1y1, short or open **)
E1 60 Right duovalve (water value, A31/1y2, short *)
E1 61 Right duovalve (water value, A31/1y2, short **)
E1 62 Right duovalve (water value, A31/1y2, short or open *)
E1 63 Right duovalve (water value, A31/1y2, short or open **)
E1 64 Rear refrigerant shut-off valve (Y67, short *)
E1 65 Rear refrigerant shut-off valve (Y67, short **)
E1 66 Rear refrigerant shut-off valve (Y67, short or open *)
E1 67 Rear refrigerant shut-off valve (Y67, short or open **)
E1 68 Rear tunnel flap vacuum valve (Y67/1, short *)
E1 69 Rear tunnel flap vacuum valve (Y67/1, short **)
E1 70 Rear tunnel flap vacuum valve (Y67/1, short or open *)
E1 71 Rear tunnel flap vacuum valve (Y67/1, short or open **)

 

How do I remove the carpet lining under the steering wheel?

 

I have E013

I have EE0 13 connection to rear climate control module fault code. After deleting the code it appears again.
I do not have separate rear climate module. What is this E013 code. Where is this connection?
Can someone help me?